Phalanx is right.
The Andrew Loomis' books are all fantastic and carry a lot of profound and truthful infornation about Figure Drawing, Perspective, Picture Composition and all.
It is just not specifically about the sequential technique typical to comics. Or Inking or computer colouring.
Still everyone interested in visual art should have looked at them (and will be then hooked). All the other How-to books authors are lightweights in comparison.
Out of print but downloadable from different Web sites. Try first http://www.saveloomis.orghttp://www.alexhays.com/loomis/

Sorry Steve Bryant, but Perspective for Comic Book Artists by David Chelsea is an awful book.
You must be some kind of mathematical genius to have found this book enjoyable, or even understandable.
For everybody else: Beware! This book will disgust you forever of perspective.
Better try to find an old out-of-print copy of Perspective Drawing by Ernest Norling. This is the book about perspective for comic artists and illustrators.

How to write science fiction and fantasy by Orson Scott Card. I know it's mostly used by novelists - but his insights to dialogue, character, and the nuggets he covers on such topics inside is helpful. He also covers the tropes of science fiction, fantasy, research, thinking outside the box, and using realism.

Anything by Burne Hogarth is excellent. I wish someone had introduced me to his books YEARS ago. It would have made me a much better artist than I am today.

The DC Comic Guide to Inking Comics, by Klaus Jansen is very helpful as well. But his tips can seem a bit biased at times, or almost contradictory. Still worth checking out, even if you're not an inker. (I think it's important to learn EVERY aspect of comic book production, even if you are not actually involved in all aspects).

The most helpful book I’ve EVER read about comics is Dave Sim’s Cerebus Guide to Self Publishing. There is only one chapter in there about illustrating, but there is loads of information in that book which answers questions I never would have thought to ask. It’s kinda hard to find these days, but if you can get ahold of the updated 2011 edition, READ IT.